A119171 Numbers k such that the k-th triangular number contains only digits {2,5,9}.

10, 34, 109, 714, 765, 774, 227825, 14092049, 334531090, 33345441365, 1360847497350, 102951958915365, 3462935043926049509, 4455459562273973825

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119170. See A119034 for a table of cross-references.

Extensions

a(13)-a(14) from Tyler Busby, Mar 31 2023